Blow-off valve



W. A. KITTS, JR.

BLOW-OFF VALVE.

APPLICATION FILED 1AN.27, 1920.

Patented Ma 2,1922.

IIL/

as. rare WILLAEDA. xir'rs, an, or PATERSON, New InasEY.

snow-err veLvE,

To all whom it may concern:

Be it known that I, TVVILLARD A. Krrrs, J 1:, of Paterson, in the county of Passaic, in the State of New Jersey, have invented new and useful Improvements in v which the following, taken in connection with theaccompanying drawings, isa "full, clear, and'exact description. V I

This invention relates to certain improvements in blow-off valves of the class set forth in my pending applications, Serial No.

.312 874, filed July 23, 1919, and Serz No.

328,7 99, filed October 6, 1919, except that in the present application the gear disc valve or gate is raised and lowered or opened and closed with a rolling motion by direct engagement with a hand operated worm or screw, the length of which is equal to or greater than the distance of movement of the valve or gate from its closed position to its extreme open position. a n

The object is to obtain greater efficiency in speed and positiveness of operation by direct v engagement between the worm and valve gear and by causing the valve to roll along a rack parallel with the axis of the worm, which not only reduces to a minlmum the number of parts but also renders the valve as a whole more durable and reliable and when disposed in a vertical position as shown aids materially in theclosing operation by the screw, particularly when the I valves are of relatively large diameter.

Other obj ects' and'uses relating to specific parts or the valve as a whole will be brought a worm gear --i and a worm -5-, meshing with the worm gear i-, all of said parts being'made of suitable metal and assembled in the manner hereinafter described.

The end sections -1 are provided with coaxial inwardly tapered passages -6- either of which may be connected to the blow-ofi pipe of a boiler or may be usedin other relation for controlling the inlet or Specification of Letters Patent.

Blow-Off Valves, of 7 exit of liquid to or from a container, each section having'itsouter end provided with a flange -7v for securement to the part of the container towhich the valve is to be at tached.

The innerend faces of the sections +1 are substantially fiat and parallel and'are spaced a suflicient distance apart to receive between them the intermediate section -2-,

the inner ends of the sections 1- being 7 provided with flanges '8--'which togetherwith the intermediate section 2 are provided with registering bolt holes 9 for receivingclamping bolts -1(l for firmly clamplng the sections together end to end with suitable p'ackings l1 at the joints to preventleakage. o i i The section 2- is provided with a main chamber 12- and a' branch chamber 13 communicating therewith .and extending vertically parallel with the axis of theworm 5t 7 The width'of the main chamber 12 transversely of the axis of the valve 3- and passages -6-- is slightly greater than the diameterof the inner endso'f said pas: sages or approximately equal to the diameter of the disc valve 3, the lower wall -1-4l being below the axis of the passages 6 andis preferably.semi-circular and concentric with said axis. I

The upper wall 1a of-the main chamberv 12 is also semi-circular and of the same radius as the-'lower wall 1% but reversed, the curvature of both walls being substantially the same as that of the valve .disc 3.

The distance between the lower and upper walls in the vertical plane of the axis of the passages '6 and valvedisc -3-- is substantially equal to twice the diameter of the valve disc to enable the latter to be ,moved from itsclosed position coaxially with. the

'. aassages 6- to its extreme opened position wholly above said passages.

The branch chamber is located at one side of the main chamber '12 and passages 6 and extends from a point below the horizontal plane of said axis to a alane slightly above the limit of upward movement of the axis of the valve disc 3- toreceive a worm or gear as 5 ofsuflicient length to assure, the movement; of the valve disc from its closed position to its ex treme opened position.

The worm 5 preferably extends from Patented May 2,1922.

Application filed January 27, 1920. Serial No. 354,413.

end to end within the chamber -13 to abut against the lower and upper end walls thereoifor holding itagainst endwise move ment and is preferably secured to a vertical- 1 shaft lhaving its lower andupper'ends journaled in suitable bearings 16+ and 17-- in the intermediate section -2', the

upper end being extended througha suitable gland +18 to the exterior of the section 2 and is providediwith a hand "wheel -19, by which theshaft, andworm may be rotated for iin' parting rotary movement to the valve disc -3. 7

The valve disc 3- is of'substantially the same axial length as the corresponding distance between the inner end faces of. the

sections ''land its end faces are substan= tially flat to properly seat against the adj acent faces of the section 17. for efl'ec tively cutting off communication between the passages 5-6- in said sections when the disc is in its closed position.

The intermediate portion of the valve disc;

is provided with peripheral teeth 20'- Within the periphery of the ends of the disc and'mesh'ing with the worm f5-, the meshing engagement being maintained by the en l gagement of the discwith the wall of the main chamber +12 directlyopposite' the branch chamber13]'and worm 5..

"This opposite wall is provided with a toothed rack 2l the teeth of which are preferably integral with the intermediate section 2, the lower end of said rack terminating a sufficient distance above the horizontal planeo f the axis of thepassages '6 to enable the'valve disc 3 to be r0- tated freely in one direction without'engaging the teeth ofthe rack'and at the same time to permit the engagement of the gear teeth therewithwhen the disc is rotated in'an opposite direction;

In like manner the upper endof the toothed racky+-21lterminates below the horizontal plane of the axis of the gear disc when the latter'is moved'to itsextremelupper position to permit said gear to be rotated in onedirection against the up- ":perwall of the main chamber '12 without engaging the teeth of said rack and permittlng reengagementwith'said teeth'wheh thegearis rotated in an opposite direction as positively return the valve to its closed position.

By permitting the valve to be rotated freely when in its closed or extreme open posi tions, permits its end faces'to be fittedmore securely: to their seats on the adjacent ends ofthe sections v1 inca-se certain portions of said faces may becomeworn more than the other portions, this free rotation'of the gears being effected by v scribed is particularly simple,

H g the rotation of the I same worm or' screw -5.. y

'lhe screw 5- is provided in this in stance with a right hand thread and it, there- 'fore, follows that when it isdesired to open the valve from its-closed position the rota-f tion of the screw -5 to theright by means of the hand wheel -'19 will cause. the disc -5 to rotate in the direction indicated by arrow f. Fig. 2, therebycausing the teeth of said disc to engage the teethof the rack -2l which in turn together with the operation of the screw will cause the disc to travel upwardly along the rack with a rotary motion until it reaches its extreme 7 open position against the upper wall 14' out of engagement with the teeth of thefrack, -I2lwhereupon the continued" rotation of the worm in the same direction will cause the disc 'to rotate freely about its axis against the upper wall 14:- if it is de.

sired to repolish the end faces of the valve 7 before returning.

Therotation of the screw in the opposite? direction will causethe teeth of the disc to reengage, the teeth or the rack thereby returning the disc to its closed position with j a minimum power without'liability of overstraining any'of the parts.

What I claim is 1 scribed, comprising a valve case havinga passage therethrough, a'valve dlSOIIlOViLblG to again rerr to and from a position across said passage and provided with peripheral gear teeth, a rotary worm in direct engagement with the gear teeth at one side of the disc, means for: r?

rotating-the worm, and a'toothed rack for engaging the'teeth at the opposite-side-off the disc andcausing said ediscto move with a rotary motion to and from aposition across the passage as the worm is rotated in reverse directions, the relation of the .gear

teeth of the disc and rackpermitting the gear teeth of the disc to be moved out of engagement with thefrack when adjusted to one of its extreme positions to allow said disc to be rotated in one direction without 7 engaging the teeth of the rack.. a

' In'witness whereof I have hereunto setmy hand this 22nd day of anuary, 1920. V

, WILLARDFAJKITTS,JR. \Vitnesses: i v Q WARREN C. WUNDER, THosJ. E. HOLMES.

7 7100 A blow-oif valve of the character de- I 

